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| 型號： | AD8602ARMZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP CMOS 8.4MHZ 8MSOP |
| 產(chǎn)品培訓模塊： | Op Amp Basics |
| 標準包裝： | 1 |
| 系列： | DigiTrim® |
| 放大器類型： | 通用 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 6 V/µs |
| 增益帶寬積： | 8.4MHz |
| 電流 - 輸入偏壓： | 0.2pA |
| 電壓 - 輸入偏移： | 80µV |
| 電流 - 電源： | 750µA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 標準包裝 |
| 其它名稱： | AD8602ARMZ-REELDKR |
AD8601/AD8602/AD8604
Rev. G | Page 17 of 24
Voltage drop is created across the 0.1 Ω resistor that is
proportional to the load current. This voltage appears at the
inverting input of the amplifier due to the feedback correction
around the op amp. This creates a current through R1, which
in turn, pulls current through R2. For the low side monitor, the
monitor output voltage is given by
×
×
=
L
SENSE
I
R1
R
R2
V
Output
Monitor
3
(2)
For the high side monitor, the monitor output voltage is
L
SENSE
I
R1
R
R2
Output
Monitor
×
×
=
(3)
Using the components shown, the monitor output transfer
function is 2.5 V/A.
USING THE AD8601 IN SINGLE-SUPPLY, MIXED
SIGNAL APPLICATIONS
Single-supply, mixed signal applications requiring 10 or more
bits of resolution demand both a minimum of distortion and a
maximum range of voltage swing to optimize performance. To
ensure that the ADCs or DACs achieve their best performance, an
amplifier often must be used for buffering or signal conditioning.
The 750 μV maximum offset voltage of the AD8601 allows the
amplifier to be used in 12-bit applications powered from a 3 V
single supply, and its rail-to-rail input and output ensure no
signal clipping.
Figure 59 shows the AD8601 used as an input buffer amplifier
to the AD7476, a 12-bit, 1 MSPS ADC. As with most ADCs,
total harmonic distortion (THD) increases with higher source
impedances. By using the AD8601 in a buffer configuration, the
low output impedance of the amplifier minimizes THD while
the high input impedance and low bias current of the op amp
minimizes errors due to source impedance. The 8 MHz gain
bandwidth product of the AD8601 ensures no signal attenua-
tion up to 500 kHz, which is the maximum Nyquist frequency
for the AD7476.
VDD
GND
SCLK
SDATA
VIN
CS
AD7476/AD7477
RS
AD8601
4
3
2
5
1
1F
TANT
SERIAL
INTERFACE
5V
SUPPLY
0.1F
10F
680nF
REF193
C/P
01
52
5-
05
9
Figure 59. A Complete 3 V 12-Bit 1 MHz Analog-to-Digital Conversion System
Figure 60 demonstrates how the AD8601 can be used as an
output buffer for the DAC for driving heavy resistive loads. The
AD5320 is a 12-bit DAC that can be used with clock frequencies
up to 30 MHz and signal frequencies up to 930 kHz. The rail-
to-rail output of the AD8601 allows it to swing within 100 mV
of the positive supply rail while sourcing 1 mA of current. The
total current drawn from the circuit is less than 1 mA, or 3 mW
from a 3 V single supply.
AD8601
4
3
2
5
1
01
52
5-
06
0
VOUT
0V TO 3V
3-WIRE
SERIAL
INTERFACE
RL
AD5320
4
5
6
3V
1F
Figure 60. Using the AD8601 as a DAC Output Buffer to Drive Heavy Loads
saving SOT-23 packages.
PC100 COMPLIANCE FOR COMPUTER AUDIO
APPLICATIONS
Because of its low distortion and rail-to-rail input and output,
the AD860x is an excellent choice for low cost, single-supply
audio applications, ranging from microphone amplification
to line output buffering. Figure 38 shows the total harmonic
distortion plus noise (THD + N) figures for the AD860x. In
unity gain, the amplifier has a typical THD + N of 0.004%, or
86 dB, even with a load resistance of 600 Ω. This is compliant
with the PC100 specification requirements for audio in both
portable and desktop computers.
Figure 61 shows how an AD8602 can be interfaced with an AC’97
codec to drive the line output. Here, the AD8602 is used as a
unity-gain buffer from the left and right outputs of the AC’97
codec. The 100 μF output coupling capacitors block dc current
and the 20 Ω series resistors protect the amplifier from short
circuits at the jack.
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
01
52
5-
06
1
2
3
4
8
1
VDD
VSS
VDD
LEFTOUT
RIGHTOUT
5V
AD1881
(AC’97)
A
R4
20
C1
100F
R2
2k
+
5
6
7
R5
20
C2
100F
R3
2k
+
B
35
29
26
36
25
AD8602
Figure 61. A PC100-Compliant Line Output Amplifier
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